COMPUTER, METHOD, AND PROGRAM

[Object]To provide a computer, a method, and a program that enable easy use of a device compatible with a second tracking system in an XR space according to a first tracking system.[Solution]A computer according to the present invention includes a processor that calculates first coordinates in a first coordinate system of a 3D object rendered in an XR space defined by the first coordinate system, calculates second coordinates in a second coordinate system different from the first coordinate system of a device, wherein the device is tracked by a tracking system related to a setting of the second coordinate system, and calculate a coordinate conversion equation that converts coordinates of the second coordinate system into coordinates of the first coordinate system based on the first coordinates and the second coordinates, in response to a predetermined operation by a user.